If a diabetic patient has a heart attack, the overall life expectancy is directly related to the patient’s condition and lifestyle interventions. If the condition is poorly controlled, the life expectancy may only be a few months or even a few weeks, and heart disease is often very acute once it develops, which may result in the patient’s sudden death or the occurrence of acute infarction or acute heart failure, etc. These acute cardiovascular events pose a great threat to the patient’s life. Threats. If the patient’s condition is well controlled, despite the presence of heart disease, but the lifestyle control is very strict, and at the same time under the guidance of the doctor is very standardized use of medication, then the overall life expectancy can be maintained for a longer period of time. If a diabetic patient with heart disease adheres to his or her medication, diet and exercise regimen, a life expectancy of 90 years or more is achievable.